Briefly after graduating from the National Taiwan Normal University in 1960, he was invited to become a member of the “Fifth Moon Group,” a revolutionary art collective at the forefront of the Chinese modern art scene. Shortly after in 1961, Han represented Taiwan for the exhibition at VI Bienal de São Paulo, Brazil, and exhibited at the 2nd Biennale de Paris, France. He increasingly gained international recognition for his abstract artwork by participating in numerous exhibits in Africa, Australia, the United States, and Europe. By 1965, at the age of 25, he held his first solo exhibition at the Taiwan Arts Center in Taipei.